DE2021315A1 - Carburetor for internal combustion engines with starting device and acceleration pump - Google Patents

Description

202131R

Dr. F. Zumstein Sr. - Dr. E. Assmann '**

Dr. R.Köoniysborger - Dip !. Phys.R. Holsbauer

Dr. F. Sumstciii j'in.

P α t e η t α η w ä I t β

8 Munich 2, Bräuhausstraße 4 / III

. 3163-70

SOGIETE INDUSTRIEILE DE BREVETS ET D'ETUDES S.I.B.E.

Carburettor for internal combustion engines with starting device and accelerator pump.

The invention relates to the carburetor for

Internal combustion engines, which apart from the main feed system and the infeed feed system, on the one hand, has a starting device which is used during commissioning and during operation of the cold engine increases the amount of fuel in the intake line of the carburetor, and on the other hand contain an acceleration pump, which generates fuel when accelerating promotes in this line, and whose movable member is connected to the main throttle body of this line that it is at the opening of this organ performs a pump stroke.

It is known that when the engine is cold, i.e.

as long as this has not reached its thermal steady state after its commissioning, it is necessary that the The air-fuel mixture supplied to the intake pipe

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enrich. A starting device is provided for this, which acts in such a way that it either has at least one opening opens, which generally supplies air-emulsified fuel in parallel with the main feed system, or the The suction line in front of this system is throttled in order to increase the negative pressure acting on it and thus its delivery capacity. In this second solution, the starting device is mostly provided by a generally eccentric one Axis carried air flap formed, which is mounted in the air inlet of the carburetor and either by hand or automatically the wider, the warmer the engine is. Most of the time the starting device or flap is also the same The main throttle organ is assigned in such a way that it opens this somewhat, when it is in action.

It has been shown that when the engine is cold

the volume of fuel injected by the accelerator pump, which is calculated for a motor which has reached its thermal steady state is not sufficient, a correct change in the operating state of the engine to ensure, especially when accelerating. When the speed is stable, the behavior of the vehicle equipped with the internal combustion engine is correct, in particular due to the small opening of the starting flap, the accelerations but are defective due to the insufficient amount of fuel injected by the accelerator pump.

The aim of the invention is to design such carburettors in such a way that the delivery rate of the acceleration pump is constantly adapted to the thermal conditions of the engine.

The carburetor according to the invention is for this purpose

characterized by means connected to the starting device which increase the useful capacity of the accelerator pump, when this device is in operation. In particular, if the starting device is through one in the intake line is formed in front of the main dining system, and the means are designed so that they Increase capacity "when the door is closed.

These funds are preferably thereby

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formed that one has the control of the starting device or flap on the moving member of the accelerator pump so act with the mechanism connecting the main throttle organ leaves that the stroke of this movable member is increased under otherwise the same circumstances when the starting device or flap is in operation,.

The invention is explained below by way of example with reference to the drawing.

1 and 2 show, partly in side view and partly in vertical section, a device according to the invention Carburettor in the position for normal operation or in the position for operation of the cold engine.

The carburettor is designed as a whole

that, in addition to the main feed system and the idle feed system, on the one hand it contains a starter device which increases the amount of fuel in the intake line 1 of the carburetor when starting up and operating the cold engine, and on the other hand it contains an acceleration pump 2 which calls for fuel into line 1 when accelerating, and the ■ movable member of which is connected to the main throttle element 3 of this line in such a way that it executes an eumphub when the element 3 is opened.

In the embodiment shown, the main feed system is formed by an air funnel 4, which is arranged in a second air funnel 5 of larger diameter and is fastened to this by arms 6, through one of which a fuel channel, which is not shown and opens into the interior of the air funnel 4, passes. The idle feed system is not shown as it plays no part in the invention * ■■ '.' ■

In front of the main feed system is.

the air inlet 7, which is generally provided with an air filter, not shown, and contains a flap 8 attached to an axis 9. These form the starting device · * - de Xlappe can be designed in any known way and either sit on an eccentric shaft 9 so that they sißh under the effect of air flow in AEE ^ line 1 automatic "· table Bffnet, or, as shown, on a non-eccentric

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■ autosatiseli iäasels. sslaea. old eter Äelise- 9 'connected lever 10 actuated ₉ imt & hQT ± m s3J.g © tai§ia © ä Bim- ! © ekenflache 11 owns _s ai't ®ia © s Betel 1t susaam ^ s ^ i ^ lst.j, - again the throttle " 3 © tuss""Sffastx) t? i3Mi the Ilapp ©" 8 gaaa- -or "partly eto Sieü @ s? - H®1ä @ 3, - 1-g- Issasi aaf eiaeorÄchse 13 "des-3-Ϊ # θ © fisoUbaffsota öesL sks? - in one direction aät -oiaoa fi? ss? Qja Si © Mlise- 13 bit the Droasel-

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'xmXnhB- © ijaerseiiss with a Brenatalt ^ © r ^:. üeitsang 1 stands on a not shown © öffaussg la fferMaisiitg «-: acts on the membrane 15. a 3? © & © ϊ "ίϊ7 _Ρ ifglsiie das? o'lume & the chamber 16 au ¥ ea?» bigger is looking for _a vEteenS sit Is © at the opposite sense by a pushrod 18 Ters.el © b © a veräea can j on which the Έηάβ 19a of a lever 19 acted weXelier with its middle section on an axis explained below ^: 2.0 loosely rotatably mounted The lever 19 is actuated by a peder 21 which surrounds a rod 22 connected to the lever H by a joint 23. The rod 22 is used to operate the pump, while the lever 14 is the throttle element 3 actuated.

The "previously described, the well-known Carburetor design works as follows.

When the engine has reached steady-state temperature, the! Ropes take the one in Pig. The flap 8 is then open, and when idling, the throttle element 3 assumes its smallest opening position When accelerating, the throttle element 3 is suddenly opened, whereby the lever 19 is pivoted counterclockwise on its axis 20 End 19a of the lever 19 moves over the. Push 18 the membrane 15 in the sense of a reduction in the volume of the chamber 16, what the injection of a fuel quantity determined by the stroke of the membrane 15 into the line 1 to 3? Wasting "

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action of the lever 19 and thus that of the throttle member 3 » so that it is independent of the thermal state of the engine.

According to the invention, the carburetor now contains

Means which are connected to the starting device or 'flap β and increase the Uutzkappe of the pump 2, if this device is in operation, that is, in the embodiment shown, it is in accordance with this capacity Enlarge the requirement for the closure of the flap 8.

According to an expedient solution

These means are formed in that the control of the starting device or flap 8 is brought into action on the mechanism or lever 19 connecting the movable member or the diaphragm 15 of the accelerator pump 2 with the throttle member * 3 so that the stroke of this movable member under otherwise - 'is enlarged in the same circumstances when the starting device or flap is in operation. For this purpose, the axis 20 of the lever 19 is firmly connected to a second axis 24 which is eccentric to the axis 20 and is rotatably mounted in a fixed bearing, for example in the housing 25 of the pump 2.

This axis 24 is solid with a through

a rod 27 with the lever 10 actuating the flap 8, · .... linked lever 26The training is made in such a way that that the closing of the flap 8 (transition from the position the pig, 1 in the rotation of the lever corresponding to FIG. 2) 10 (counterclockwise) is accompanied by such a shift of the center 0 of the axis 20 that this is in the Transverse direction away from the axis of the plunger 18.

The operation of the carburetor improved according to the invention is then as follows

The colder the engine, the more there is

the flap 8 is closed, the further away the center C of the axis 20 is in the transverse direction from the plunger 18, the greater the linear displacement of the end 19a of the lever 19 for a certain rotation of the lever 19 ₉ and the greater the stroke of the Diaphragm 15 and thus finally that of the acceleration pump 2 under otherwise identical circumstances}

109885/0694 bad original

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■■ '. & fi | of KEi § ist.pit I ^ or Lg die. long © ies Hebelsria © 6e © if © fe © l © 19 g ^ ischen the "Centrum ■ G der -axis 2 © -" be fiej? Attacking iiai © of S.tossels-IS in normal operation sw "at home € θϋ IxalttE.-Jiotors denotes · Apparently ie-t tie long Sg "gs? Os® © ff. as ^ i © chants Ij ^ ₈ . so that the hooves of Hembraa- 15 is larger than in Fig.- 1 "in the case of Fig OCE _o S.

With this, the task is solved, which consists in the injected by the acceleration pump The colder the engine, the greater the fuel volume is.

^{109885/0594 BATH} ORIGINAL

Claims (1)

which apart from the Ea «|> tsp» is «syet © a llkd deia idle speed · '" system "on the one hand. ■ eiiü«; StartforrielrNiBg: _r which; i &; jier _: - £ n ~ V suction-slippery des ' _ Vergat ^ i ^ ile ^ Brenüstoffm ^ iige: ..Üei trlebsetzimg- und bei.äeis -: $ «t ^ i © 1s t * S; fealt-en. Winm ^ sert _r and on the other hand öi & i Sesi ^ lewnigiEMgap ^^ which at acceleration ^ göii fuel ia this changes, and their movable slied with döffl Hauptdrössiorgaiai this line so vertjundeii iat | that this organ carries out a puaphub at the Uffnüag, identified by means connected to the starting device (S), which increase the capacity of the acceleration puffipe (2 :) when this device (8) is in operation » SU) Yergaser according to claim 1, where wel> * chem the starting device üureh means disposed in the intake passage upstream of the main feed system flap is formed, characterized in that these means are designed as "you can increase the capacity of the acceleration pump, ^ f the flap (8) is closed · 3) Carburettor according to claim 1 or 2, since ' characterized in that the control system is used to form these funds the starting device or flap (8) so on the movable Link (15) of the acceleration pump (2.) with the main throttle element (3) connecting mechanism (19) has the effect that the stroke of the movable member (.15) is increased under otherwise the same circumstances when the starting device or -flap (8) -activating * 109805/0594 • BAD ORlGlMAL